| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] to | 2050 |
|
| 2 | could [vb infin] to | 2045 |
|
| 3 | [modal v] return to | 640 |
|
| 4 | [vb mod] return to | 640 |
|
| 5 | could return [prep] | 54 |
|
| 6 | could return [prep] | 54 |
|
| 7 | could return to | 39 |
|
| 8 | could return to | 39 |
|
| 9 | could return to | 39 |
|
